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Title:
The GALEX Arecibo SDSS Survey - VIII. Final data release. The effect of group environment on the gas content of massive galaxies
Authors:
Catinella, Barbara; Schiminovich, David; Cortese, Luca; Fabello, Silvia; Hummels, Cameron B.; Moran, Sean M.; Lemonias, Jenna J.; Cooper, Andrew P.; Wu, Ronin; Heckman, Timothy M.; Wang, Jing
Affiliation:
AA(Max-Planck Institut für Astrophysik, D-85741 Garching, Germany; Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; ), AB(Department of Astronomy, Columbia University, New York, NY 10027, USA), AC(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; European Southern Observatory, D-85748 Garching, Germany), AD(Autoliv Electronics Germany, Theodor-Heuss-Str. 2, D-85221 Dachau, Germany), AE(Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721, USA), AF(Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA), AG(Department of Astronomy, Columbia University, New York, NY 10027, USA), AH(National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Rd, Chaoyang, Beijing 100012, People's Republic of China), AI(Commissariat à l'Energie Atomique (CEA), F-91191 Gif-sur-Yvette, France), AJ(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA), AK(Max-Planck Institut für Astrophysik, D-85741 Garching, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 436, Issue 1, p.34-70 (MNRAS Homepage)
Publication Date:
11/2013
Origin:
OUP
Astronomy Keywords:
galaxies: evolution, galaxies: fundamental parameters, radio lines: galaxies, ultraviolet: galaxies
Abstract Copyright:
2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stt1417
Bibliographic Code:
2013MNRAS.436...34C

Abstract

We present the final data release from the GALEX Arecibo SDSS Survey (GASS), a large Arecibo programme that measured the H I properties for an unbiased sample of ˜800 galaxies with stellar masses greater than 1010 M&sun; and redshifts 0.025 < z < 0.05. This release includes new Arecibo observations for 250 galaxies. We use the full GASS sample to investigate environmental effects on the cold gas content of massive galaxies at fixed stellar mass. The environment is characterized in terms of dark matter halo mass, obtained by cross-matching our sample with the Sloan Digital Sky Survey (SDSS) group catalogue of Yang et al. Our analysis provides, for the first time, clear statistical evidence that massive galaxies located in haloes with masses of 1013-1014 M&sun; have at least 0.4 dex less H I than objects in lower density environments. The process responsible for the suppression of gas in group galaxies most likely drives the observed quenching of the star formation in these systems. Our findings strongly support the importance of the group environment for galaxy evolution, and have profound implications for semi-analytic models of galaxy formation, which currently do not allow for stripping of the cold interstellar medium in galaxy groups.
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